JPH02136082A - Position detector - Google Patents

Abstract

PURPOSE:To detect the position of a rotary body with high accuracy by providing a joint network including three inverter circuits, a group of moving direction detecting pulse generating circuits including six moving direction detecting pulse generating circuits, an addition/subtraction pulse train generating circuit including two OR gates and an addition/subtraction counter. CONSTITUTION:A moving direction detecting pulse generating circuit 5 comprises D flipflops 51, 52 provided with reset function, D flipflops 53, 54 and an inverter circuit 55, and position signals (g) are fed through an input terminal LV to D-terminal of the D flipflop 51 and the input terminal of the inverter circuit 55. The level of the position signal connected to the LV terminal is detected every time when the rising edge of the position signal connected to EG terminal arrives, and an addition pulse is applied onto UP terminal if the position signal has high level while a subtraction pulse is outputted to DN terminal if the position signal has a low level.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application The present invention relates to a position detection device for detecting the position of an object that moves linearly or rotationally.

2. Description of the Related Art In a conventional object position detection device, for example, a position detection device for a rotating body of a motor, a rectangular waveform A having a phase difference of approximately 90 degrees in electrical angle corresponding to the rotational position of the rotating body [[1], By generating a two-phase position signal B and detecting the level of the B phase at the rising edge (or falling edge) of the A phase, the direction of rotation of the rotating body can be detected. and sensor application technology” p120,
Mima Data System, S61.1.31 issue), control the addition and subtraction of the addition and subtraction counters according to the ejection results fT.
j, and the rising edge of either phase A or phase B (
Alternatively, a method is adopted in which the addition/subtraction counter counts at the falling edge).

Problems to be Solved by the Invention However, in the above method, the counting of the addition/subtraction counter lags behind the detection of the moving direction, and it only operates on either the rising edge or the falling edge of the position signal. If the moving direction of the object is reversed, malfunction may occur, making it difficult to accurately detect the position of the object. Furthermore, since the position can only be detected using a two-phase position signal, there is a problem in that it is not possible to increase the resolution of position detection by increasing the number of phases of the position signal.

In view of the above-mentioned problems, the present invention provides a position detection device that can detect the position of an object accurately and with high resolution using position signals of two or more phases.

Means for Solving the Problems In order to solve the above problems, the position detection device of the present invention has the following features:
The i-th position signal and the j-th phase (j
≠ 1) 2m pulses (m: Natural number, l≦m≦
n) and the 2m addition pulse signals outputted from the 2m movement direction detection movement direction detection pulse generation circuits into one addition pulse train signal,
It consists of an addition/subtraction pulse train generation circuit that synthesizes 2m subtraction pulse signals into one subtraction pulse train signal, and an addition/subtraction counter that adds up the addition pulse train outputted from the addition/subtraction pulse train generation circuit and subtracts the $i addition pulse train. It is something that

According to the above-described configuration, the present invention uses a plurality of phase position signals corresponding to the position of an object, and detects the movement direction by a plurality of movement direction detection pulse generation circuits each time the rising edge and falling edge of the position signal arrive. At the same time as the detection is performed, an addition pulse or a subtraction pulse is generated according to the movement direction detection result, and these pulses are combined into an addition pulse train and a subtraction pulse train, respectively, and counting is performed by an addition/subtraction counter.

In this case, since the moving direction detection and addition/subtraction counting control are performed simultaneously, and the moving direction is detected at both the rising edge and the falling edge of the position signal, no malfunction occurs. Furthermore, since the movement direction is detected at both the rising edge and the falling edge of the position signals of multiple phases, the number of movement direction detections per certain movement (2) is large.

Therefore, the position of the object can be detected accurately and with high precision.

Embodiment Hereinafter, a position detection device according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, detection of the position of a rotating body is shown. It is also assumed that a position signal generator installed near the rotating body outputs a three-phase position signal corresponding to the position of the rotating body.

FIG. 1 shows an overall block diagram of a position detection device in one embodiment of the present invention in the case of three phases (n=3). In Figure 1, 1 is an inverter circuit 11.12.1
3.

Reference numeral 2 denotes a moving direction detection pulse generation circuit group consisting of six (m=3) movement direction detection pulse generation circuits 21, 22, 23, 24, and 25.26. Here, the moving direction detection pulse generation circuits 21, 22, 2324, 25, and 26 are all equal circuits, and the details will be explained later. 3
is an addition/subtraction pulse train generation circuit consisting of six OR circuits 31 and 32. , 4 are addition/subtraction counters.

The input position signals a, b, c are input to the input terminals 11 of the connection network 1.
i, 12i', and 13i, respectively. In this embodiment, the level of the position signal of the i-th phase (i=1, 2.3) is
The connection circuit network 1 is configured so as to detect both the rising edge and the falling edge of
is configured. This connection circuit! In i11, the position signal a is sent to the output terminal 111, the position signal is sent to the output terminal lie, the inverted signal of the position signal a is sent to the output terminal 121 through the inverter circuit 11, and the position signal is sent to the output terminal 12e through the inharter circuit 12. An inverted signal of the position signal C is sent to the output terminal 131, a position signal C is sent to the output terminal 13e, an inverted signal of the position signal C is sent to the output terminal 141 through the inverter circuit 12, and an inverted signal of the position signal C is sent to the output terminal 14e. An inverted signal of the position signal C is sent to the output terminal 151 through the park circuit 13, an inverted signal of the position signal a is sent to the output terminal 15e through the inverter circuit 11, and a position signal is sent to the output terminal 161 through the inverter circuit 13. The inverted signal of C is connected to the output terminal 16e, and the position signal a is connected to the output terminal 16e.

Output terminal 111 of connection circuit 1. The signal output from the LV terminal of the moving direction detection pulse generation circuit 21, E
Each is connected to the C terminal. Output terminals 121, 12e
The signal output from the moving direction detection pulse generation circuit 22
Signals output from the six output terminals 131 and 13e, which are connected to the LV terminal and EC terminal of the moving direction detection pulse generating circuit 23, respectively, are connected to the LV terminal and the EC terminal of the moving direction detection pulse generation circuit 23, respectively. The signals outputted from the output terminals 141 and 14e are respectively connected to the LV terminal EG terminal of the moving direction detection pulse generation circuit 24. The signal output from the output terminal 15115e is the LV terminal of the moving direction detection pulse generation circuit 25,
Each is connected to the EC terminal. Output terminals 161, 16
The signal output from e is the moving direction detection pulse generation circuit 2.
It is connected to the LV terminal and EC terminal of No. 6, respectively. Also,
Via the input terminal 2c of the moving direction detection pulse generation circuit group 2, a clock signal with a sufficiently high frequency is input to each CL terminal of the movement direction detection pulse generation circuits 21, 22, 23, 24, 25, 26. Moving direction detection pulse generation circuit 2
1, 22 23. 24 The signals output from each UPO i child of 2526 are sent to each output terminal 21u, 22u, 23u, 24u, 25u, 26u of moving direction detection pulse generation circuit group 2.
O of the addition/subtraction pulse train generation circuit 3
It is input to the input terminal of the R circuit 31. Further, the signals output from each DN terminal of the moving direction detection pulse generation circuits 21, 22, 2324, 25, 26 are the signals output from each output terminal 21d, 22d, 23d, 24 of the moving direction detection pulse generation circuit group 2.
d, 25d and 26d, respectively, to the input terminal of the OR circuit 32 of the addition/subtraction pulse train generation circuit 3. The output signals d and e of the addition and subtraction pulse train generation circuit 3 are sent to the UP terminal and D of the addition and subtraction counter 4 via output terminals 3u and 3d.
Each is input to the N terminal. CN of addition/subtraction counter 4
The output signal f outputted from the terminal is outputted to the outside from the output terminal 4c as a position detection signal.

FIG. 2 shows a detailed circuit diagram of the moving direction detection pulse generating circuit of the position detecting device in one embodiment of the present invention shown in FIG. 1. FIG. 3 is a waveform diagram for explaining the operation of the circuit of FIG. 2.

In FIG. 2, 5 is a moving direction detection pulse generation circuit, and is a D flip-flop 151.5 with a reset terminal.
2 and D flip-flop 5354 and inverter circuit 5
It is composed of 5.

D terminal of D flip-flop 51 and inverter circuit 5
The position signal g is input to the input terminal 5 via the input terminal LV. The output signal of the inverter circuit 55 is input to the D terminal of the D flip-flop 52. D flip
A position signal is input to each C terminal of the flop 5152 via an input terminal EC.

The output signal of the D flip-flop 51 is input to the D terminal of the D flip-flop 53. D Furinbu Fronttub 54's Diko has D Furinbu, Fu.

- The output signal of the flop 52 is input. Further, a sufficiently high frequency clock signal is input to the C terminal of the D flip-flop 53, 54 via the CL terminal.

The output signal of the D flip-flop 53 is input to the reset terminal (RD terminal) of the D flip-flop 51, and at the same time, an addition pulse is outputted to the outside through the output terminal UP. The output of the D flip-flop 54 is input to the reset terminal (RDi) of the D flip-flop 52, and at the same time a subtraction pulse is output to the outside through the output terminal DN.

Next, the detailed operation of the moving direction detection pulse generating circuit of the position detecting device shown in FIG. 2 will be explained using the signal waveform diagram of FIG. 3.

In FIG. 3, the horizontal axis is time t. The vertical axis shows the voltage level. When the rotating body is rotating in the CW force direction (clockwise direction), the rising edge of the position signal occurs during the high level period of the position signal g, and the falling edge of the position signal occurs when the position signal g is at the low level. Suppose that it occurs during the period of . Also, when the rotating body is rotating in the CCW direction (counterclockwise direction), the rising edge of the position signal g
It is assumed that the falling edge of the position signal g occurs during the low level period of the position signal g, and the falling edge of the position signal g occurs during the high level period of the position signal g.

Now, assuming that the rotating body is rotating in the CW force direction, when the rising edge of the position signal arrives, the position signal g is at a high level, so this signal g is input to the D terminal of the D flip-flop 51, and the time At L1, the output signal of the D flip-flop 51 changes to high level. This signal is input to the D4 child of the D flip-flop 53, and this D
The output signal X of the flip-flop 53 also changes to high level. At this time, the signal X is transferred to the D flip-flop 5.
1, the output signal of the D flip-flop 51 changes to a low level. Then, the output signal X of the D flip-flop 53 also changes to low level.

As a result, a minute pulse with a width corresponding to the period of the clock signal inputted to the C terminal of the D flip-flop 53 through the UP terminal is generated in the signal χ.

This signal X is outputted to the outside through the output terminal UP as an addition pulse.

Next, when the rotating body reverses its rotational direction and rotates in the CCW direction, when the rising edge of the position signal arrives, the position signal g is at a low level, but after this signal g is input to the inverter circuit 55, The signal converted to high level is input to the D terminal of D flip-flop 52, and at time L2, output signal 1 of D flip-flop 52 changes to high level. This signal is connected to the D flip-flop 54.
The output signal y of this D flip-flop 54 also changes to high level. At this time, since the signal y resets the D flip-flop 52, the output signal l of the D flip-flop 52 changes to a low level. Then, the output signal y of the D flip-flop 54
also changes to low level. As a result, a minute pulse width corresponding to the period of the clock signal inputted to the 0g terminal of the D flip-flop 54 through the UP terminal is generated in the signal y. This signal y is outputted to the outside through the output terminal DN as a subtraction pulse.

Assume that the rotating body reverses its direction of rotation again and starts rotating in the CW force direction. Then, when the rising edge of the position signal g arrives, the position signal g is at a high level, so this signal g becomes D.
It is input to the DI4 child of the flip-flop 51, and the time L
At 3, the output signal of the D flip-flop 51 changes to high level.

As a result, the signal X is generated by the same circuit operation as at time t1.
A minute width pulse is generated, and this signal X is outputted to the outside through the output terminal UP as an addition pulse. Furthermore, assume that the rotating body reverses its rotational direction and starts rotating in the CCW direction. Then, when the rising edge of the position signal arrives, the position signal g is at a low level, but this signal g is input to the inverter circuit 55 and then converted to a high level. input to the terminal,
At time L4, the output signal 1 of the D flip-flop 52 changes to high level. As a result, a minute width pulse is generated in the signal y by the circuit operation similar to that at time M, and this signal y is outputted to the outside through the output terminal DN as a subtraction pulse.

As described above, the moving direction detection pulse generation circuit shown in FIG. 2 detects the level of the position signal connected to the LV terminal every time the rising edge of the position signal connected to the EC terminal -F arrives, and detects the level of the position signal connected to the LV terminal. This circuit outputs an addition pulse to the UP terminal if the level is high, and outputs a subtraction pulse to the DN terminal if the level is low. This circuit operates at the rising edge of the position signal (green), but if the position signal (g) is connected to the LV terminal through an inverter circuit, and the position signal (g) is connected to the EC terminal through the inverter circuit, the falling edge of the position signal (h) This moving direction detection pulse generation circuit can be operated in the following manner.

Next, the overall operation of the position detection device shown in FIG. 1 will be explained using the signal waveform diagram in FIG. 4.

In FIG. 4, the horizontal axis is time t. The vertical axis shows the voltage level. Three-phase position signals a, b.

C indicates that the signal shown in FIG. 4 is generated as the rotating body rotates. Now, assuming that the rotating body is rotating in the CW force direction, when the falling edge of the position signal a arrives at time t1, the position signal C is at a low level. Therefore, the connection circuit y
4I, a minute width pulse is generated in the output signal 26u of the position signal detection movement direction detection pulse generation circuit 26, in which the position signal C is connected to the LV terminal through the inverter circuit 13, and the position signal a is connected to the EC terminal. is OR
The signal d passes through the circuit 31 and generates a minute width pulse. This pulse is output as an addition pulse from the output terminal 3u, and then input to the UP terminal of the addition/subtraction counter 4, and the count value of the addition/subtraction counter 4 increases by one to the 0th order.
Assume that the rotating body reverses its rotational direction and rotates in the CCW direction. When the rising edge of the position signal C arrives at time L2, the phase signal S is at a low level. Therefore, a minute width pulse is generated by the connection circuit network 1 in the output signal 23d of the moving direction detection pulse generation circuit 23 to which the position π signal is connected to the LV terminal and the position signal C is connected to the EC terminal, and this pulse is OR The signal e passes through the circuit 32 and generates a minute width pulse. This pulse is output as a subtraction pulse from the output terminal 3d, and then inputted to the DN terminal of the addition/subtraction counter 4, and the count value of the addition/subtraction counter 4 is decreased by one. Furthermore, the rotating body reverses the rotation direction and rotates CW.
Suppose it rotates in the direction of force. When the rising edge of the position signal C arrives at time L3, the phase signal S is at a high level. Therefore, the position signal L by the connection network 1 is
A minute width pulse is generated in the output signal 23u of the moving direction detection pulse generation circuit 23, which is connected to the V terminal and the position signal C to the EC terminal, and this pulse is passed through the OR circuit 31 to the output signal 23u.
A very small width pulse is generated in the signal d. This pulse is output from the output terminal 3u as a calo calculation pulse, and then is inputted to the UP terminal of the addition/subtraction counter 4, and the calculated value of the addition/subtraction counter 4 increases by one.

Then, assume that the rotating body reverses its rotational direction again and rotates in the CCW direction. When the falling edge of the position signal C arrives at time, the phase signal S is at a high level. Therefore, the connection circuit %l causes the position signal C to pass through the inverter circuit 12 to the LV terminal, and the position signal C to the output signal 24d of the moving direction detection pulse generation circuit 24, which is connected to the EC terminal through the inverter circuit 13. is generated, and this pulse passes through the OR circuit 32 to generate a minute width pulse in the signal e. This pulse is output as a subtraction pulse from the output terminal 3d and then input to the DN terminal of the addition/subtraction counter 4, and the count value of the addition/subtraction counter 4 is decreased by one. In this way, the position signal a
, b, c, position detection is performed every time a rising edge or a falling edge of signal f arrives, and the signal waveform shown in FIG. 4 appears in signal f as a position detection result.

As described above, according to this embodiment, in the case of three phases,
A connection circuit network including three impark circuits, a movement direction detection pulse generation circuit group including six movement direction detection pulse generation circuits, two OR circuits, an addition pulse train generation circuit, and an addition/subtraction counter are provided. Thereby, the position of the rotating body can be detected with high precision.

Effects of the Invention As described in ``2'', the present invention provides n4 [
1 (a natural number equal to or greater than n+2) rectangular wave position signals, each time the rising edge and falling edge of the i-phase position signal and the j-phase (j#i) position signal arrive, the moving direction of the object is determined. 2m (m: natural number, 1≦m≦n) moving direction detection pulse generation circuits configured to output addition pulses or subtraction pulses according to the moving direction detection result at the same time as the detection; a sum subtraction pulse train generation circuit that converts the 2m addition pulse signals outputted from the detection pulse generation circuit into one addition pulse train signal and the 2m $i addition pulse signals outputted from the detection pulse generation circuit into one subtraction pulse train signal; The position of an object can be detected accurately and with high resolution using a simple method using an addition/subtraction counter that performs addition using an addition pulse train and subtracting using a subtraction pulse train output from an addition/subtraction pulse train generation circuit.

[Brief explanation of the drawing]

FIG. 1 is an overall block diagram of a position detecting device according to an embodiment of the present invention, FIG. 2 is a detailed circuit diagram of a moving direction detection pulse generation circuit of a position detecting device according to an embodiment of the present invention, and FIG. 2 is a signal waveform diagram for explaining in detail the operation of the moving direction detection pulse generation circuit in FIG. 2, and FIG. 4 is a signal waveform diagram for explaining the overall operation of the position detection device in FIG. 1. 1... Connection circuit network, 2... Movement direction detection pulse generation circuit group, 3... Addition/subtraction pulse train generation circuit, 4... Addition/subtraction counter, 5...・・・・・・
Movement direction detection pulse generation circuit. Name of agent: Patent attorney Shigetaka Awano Haka 1st

Claims (2)

[Claims] (1) Rising edges and rising edges of the i-phase position signal and the j-phase (j≠i) position signal of the n-phase (n: natural number of 2 or more) rectangular wave position signals corresponding to the position of the object Each time a falling edge arrives, 2m pulses (m: natural number, 1
≦m≦n);
an addition/subtraction pulse train generation circuit that synthesizes 2m addition pulse signals output from the moving direction detection pulse generation circuits into one addition pulse train signal and 2m subtraction pulse signals output from the one subtraction pulse train signal; An object position detecting device comprising: an addition/subtraction counter that performs addition using an addition pulse train and subtracting using a subtraction pulse train output from the addition/subtraction pulse train generating circuit. (2) The position detection device according to claim 1, wherein the position signal of the j-th phase is configured to be j=i+1 (j=1 when i=n).